Dear Megh,
Try this:

a = matrix(rnorm(36), 6)
a[upper.tri(a)]<-a[lower.tri(a)]
a

HTH,


Jorge



On Sun, Sep 21, 2008 at 1:47 PM, Megh Dal <megh700004@yahoo.com> wrote:

> I have following matrix :
>
> a = matrix(rnorm(36), 6)
>
> Now I want to replace the lower-triangular elements with it's
> upper-triangular elements. That is I want to make a symmetric matrix from a.
> I have tried with lower.tri() and upper.tri() function, but got desired
> result. Can anyone please tell me how to do that?
>
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